window.onload = function(){
	let open=document.getElementById('open');
	let close=document.getElementById('close');
	let button=document.getElementById('btn');
	let mima=document.getElementById('mima');
	open.style.display='none';
	button.onclick = function(){
		if(close.style.display=='none'){
			close.style.display='block';
			open.style.display='none';
			mima.type='password';
		}else{
			close.style.display='none';
			open.style.display='block';
			mima.type='text';
		}
	}
}